Shift control device retrofitted to inhibit a downshift to first

Details Shift control device retrofitted to inhibit a downshift to first Shift control device retrofitted to inhibit a downshift to first

1993-01-21

1995-05-09

Wright, Dirk

Interrelated power delivery controls, including engine control

Transmission control

With clutch control

477 78, F16H 528

Patent

active

054135419

ABSTRACT:
A shift control device for a vehicle's automatic transmission that cannot normally be locked in second gear, but will automatically downshift from second to first gear under predetermined conditions. The shift control device includes a power translator connected to a S-2 shift solenoid of the vehicle, a manual control switch, a frequency-to-voltage converter for receiving a speed signal of the vehicle, and a voltage comparator for comparing a throttle signal of the vehicle and the output from the frequency-to-voltage converter. Without the shift control device, a downshift--in one particular type of transmission--is normally effected when the S-2 shift solenoid is deactivated by the transmission controller. The shift control device is connected to the S-2 shift solenoid in parallel with the transmission controller. When the manual control switch is operated by a user, and the throttle and speed signals are within predetermined ranges, the power transistor will be biased to maintain the S-2 shift solenoid in an activated state independently of the transmission controller to inhibit automatic downshifting.

REFERENCES:
patent: 5012698 (1991-05-01), Hayosaki
patent: 5025686 (1991-06-01), Sato et al.
patent: 5088351 (1992-02-01), Miyake et al.
patent: 5089065 (1992-02-01), Braun
patent: 5099720 (1992-03-01), Raue
patent: 5233525 (1993-08-01), Overmann et al.

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